Supplier Page from Aladdin Scientific Corporation for (4-Aminophenyl)urea
1,3-Dichloro-2-nitrobenzene from Aladdin Scientific Corporation
3-Methyl-2-butanol from Aladdin Scientific Corporation
Nα-(tert-Butoxycarbonyl)-L-tryptophan N-Succinimidyl Ester from Aladdin Scientific Corporation
N,N'-Di(1-naphthyl)benzidine (purified by sublimation) from Aladdin Scientific Corporation